pthread_mutexattr_getprotocol(3THR) gets the protocol attribute of a mutex attribute object.
#include <pthread.h> int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *attr, int *protocol);
attr points to a mutex attribute object created by an earlier call to pthread_mutexattr_init().
protocol contains the protocol attribute: PTHREAD_PRIO_NONE, PTHREAD_PRIO_INHERIT, or PTHREAD_PRIO_PROTECT.
On successful completion, pthread_mutexattr_getprotocol() returns 0. Any other return value indicates that an error occurred.
If the following condition occurs, pthread_mutexattr_getprotocol() fails and returns the corresponding value.
Neither of the options, _POSIX_THREAD_PRIO_INHERIT nor _POSIX_THREAD_PRIO_PROTECT is defined and the implementation does not support the function.
If either of the following conditions occurs, pthread_mutexattr_getprotocol() might fail and return the corresponding value.